[FIX] invalid redeclaration

[eseiler]

A constrained declaration may only be redeclared using the same syntactic form. No diagnostic is required.

Resolves #3138

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Name	Status	Preview	Comments	Updated
seqan3	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 29, 2023 at 2:29AM (UTC)

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c5ec15b) 98.18% compared to head (247568f) 98.18%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3139 +/- ## ======================================= Coverage 98.18% 98.18% ======================================= Files 276 276 Lines 12292 12292 ======================================= Hits 12069 12069 Misses 223 223 ``` | [Impacted Files](https://codecov.io/gh/seqan/seqan3/pull/3139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan) | Coverage Δ | | |---|---|---| | [...alignment/matrix/detail/two\_dimensional\_matrix.hpp](https://codecov.io/gh/seqan/seqan3/pull/3139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9zZXFhbjMvYWxpZ25tZW50L21hdHJpeC9kZXRhaWwvdHdvX2RpbWVuc2lvbmFsX21hdHJpeC5ocHA=) | `97.64% <ø> (ø)` | | | [...ix/detail/two\_dimensional\_matrix\_iterator\_base.hpp](https://codecov.io/gh/seqan/seqan3/pull/3139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9zZXFhbjMvYWxpZ25tZW50L21hdHJpeC9kZXRhaWwvdHdvX2RpbWVuc2lvbmFsX21hdHJpeF9pdGVyYXRvcl9iYXNlLmhwcA==) | `100.00% <ø> (ø)` | | | [include/seqan3/utility/views/pairwise\_combine.hpp](https://codecov.io/gh/seqan/seqan3/pull/3139?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan#diff-aW5jbHVkZS9zZXFhbjMvdXRpbGl0eS92aWV3cy9wYWlyd2lzZV9jb21iaW5lLmhwcA==) | `100.00% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=seqan)

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